Electrically-heated tool.



' W. I. THOMPSON.

-ELECTRICALLY HEATED TOOL.

APPLICATION FILED FEB. 5. 19I5.

Patented Oct. I9, 1915.

' UNITED STATES PATENT OFFICE.

WILLIAM I. THOMPSON, OF STONEHAM, MASSACHUSETTS, ASSIGNOB OF-ONE-T IBDTO AmoNYM. mm mm onn-rnmnro wanna .1. mm, BOTH or WOBURN, SSA-cnusnrr'rs.

ELECTBICALLY-HEA'IED TOOL;

1,157,343 Specification of Letters Patent. Patented Qct. 19, 1915Application filed =February 5, 1915. Serial No. 5,253.

To all whom it may concern:

Be it known that I, WILLIAM I. THOMP- SON, a citizen of the UnitedStates, and resident of Stoneham, in the county of Middlesex and Stateof Massachusetts, have invented certain new -and useful Improvements inElectrically-Heated Tools, of which the following is a specification.

This invention relates to electrically heated tools, and particularly tosuch tools adapted for use in finishing external parts of boots andshoes.

The invention has for its object to provide a tool of this character ofsimpleand durable construction adapted to perform rubbin operations on aboot or shoe, and prefers. 1y adapted also to perform percussiveoperations.

The invention consists in the improvements which I will now proceed todescribe and claim.

Of the accompan ing drawings formmga part of this speci cat1on: Figure 1represents a side elevation of a tool embodying my invention; Fig. 2represents a longitudinal section on line 2-2 of Fig. 1;- Fig. '3represents a section on line 33 of Fig. 1; Fi 4 represents a. sectionalview of the tool body; Figs. 5 and 6 represent enlargements of ortionsof Fig. 2.

he same-reference characters indicate the same or similar parts in allthe views.

My improved tool includes a heating unit includin -a spool composed of acore 12 of heat-con ucting metal having an outer flange 13 integral withsaid core and -an inner flange 14, preferably ;.of insulating materialsuch as mice, and. formed byes. sembling centrally perforated mica Idisks on the reduced end portion 16 of the core. The flange 14. abutsagainst a shoulder 19 on the core, and is confined a amst said shoulderby a washer-20 applie to the re duced portlon 16 and rigidly secured byup setting the. end .ofsaid portion to form a head 21. The flange 14 istherefore inseparably secured'to the core by means unafl'ect-' ed by theexpansion and contraction of the core. The outer end of the spool isre.-

vided' with an externally threaded stu '22" constitutin aheat-conducting coupling member adapted to detachably engage a threadedcavity 23 in the tool body 24 which acts upon a'boot or shoe' or otherartlcle.

Upon the spool 12 and the, flanges there- I l t by n' of are wound coils25 of resistance wire, the

coils being allformed' 'froina. single length of mm and insulated fromeachjother pref erably'by layers of mica 2 59 applied during the windingoperation. ,TheIouter-end convolutions of the wire areins'ulated fromthe flange 13'by a mica washer aliii- The resistance wire'coilsfaresurrounded 'a-'-c ylin'- drical metal casing 26- which may; e' fsecuredto the spool by one or more screws. .27 'en;

ga 'ng one of the spool'flangesiz' he casing 26"is provided witha' shankcomposed of an air-cooled spiderformed'by Inclined radial arms 29integral with: the casing, and a tubularfportion 28; 'connected with theouter ends, of the arms. "The spider portion of the shank permitsa--.f-ree circulation of air around the arms composing it,

so that the tubular'portion 28 is not liable resistance coils 25 areconducted throng the insulating flange 14tobinding posts 33 em-. beddedin said flange..-and-i=projecting into the air-cooled. spider, andat-said posts are connected with suitablyinsulated' leading wires 34extending through the tubular shank portion '28. The s aces between thespider arms 29 permit ree accessj-to' the bmding posts 33; The wires 34'e'xt'end to aicavity 36 in the outer end of the handle,

and through 'an inclined orifice 37 in the handle. The cavity 36 isclosed by a plug' 38tsecured by screws 39. The passage 37 is inclined topermit the leading wires to pass laterally through the handle withoutbeing abru tly bent at 1 any point and without liabi ity ofthe injuriouskinking of the usual: flexible extensions of said leading which areconnected with the source of electrical energy. The leading wires areeach" preferably composed of a ,lurality ofintertwisted strands of fineforming what is 'kno'w'n'as. i tai l wire and- -;ofas a tos-cord, eachone 11 0,

i see head.

wound in the opposite'direction from the other.

The spool 12 andits flanges 13 "and 14;, and the casing 26, constitute arigid holder for the resistance wire, said holder carrying the couplingmember 22 and the handle, and closely fitting the socket. hereinafterreferred to, formed in the body.

The tool body 24 has a cylindrical socket 40 open at the inner. end ofthe body and formed to snugly and removably fit the casing 26. Thepartially cylindrical portion of the wall of said socket is adapted toserve as a hammer head by which the operator can perform variouspercussive as well as rubbing operations on the external surface of aboot or shoe. Said portion is relatively thick and is reinforced orbacked by the casing 26, which also has a substantial thickness, and inefiect is a part of the hammer The rubbing or burnishingportions of thebody are preferably formed by a flat face 42 forming one side of thebody and extending from end to end of the body, and an inclined marginalface 48 which intersects the margin of the face 42 at a substantiallyacute angle, and is substantially U-shaped and extends transverselyacross the Y outer end of the body and longitudinally alo'ng the sidesthereof. In other words, the faces 42 and 43 form a thin-edged liphaving a U- shaped edge extending lengthwise and across thebody one sideof said lip formed by the face 43 being inclined, and the other sidefiat. A considerable portion of each of saidfaces is in close proximityto the heatmg unit and adapted to be quickly heated thereby and toconduct heat to other portions of'said faces.

The body is detachably secured to the spool by theengagement of the stud22 with the cavity23, and the outerface of the spool .5 flange 13 abutsagainst the inner end ofthe.

socket 40,. so that heat is directly conducted to the body by saidflange as well as by the casing 26. Since the burnishing faces extendfrom end to end of the body, their inner end portions are in closeproximity not only to the heating unit, as above stated, but also to thehandle. The length of .the tool as a whole is therefore reduced to themim- "mum, so that the muscular exertion and fatigue of the operator inmanipulating the tool are correspondingly reduced.

The body formed as shown is adapted. to act on bread surfaces and on thesides of creases such as the crease between the welt and upperof a shoe.a

Theportion of the body 24 containingthe socket 4O constitutes atubularend portion, and the portion at the inner end of the socketconstitutes a solid end portion, which contains the coupling member 22and 1s uniformly affected by heat conducted from the resistance wirethrough the holder" 12 and coupling member 22. The burnishing face 42 isformed partly on the solid portion and partly on the tubular portion.The heatconducting coupling member 22 is therefore located centrallywith relation to said. face, so that the heat conducted thereby isquickly and uniformly distributed throughout the entire area of saidburnishing face. The same statement is applicable to the burnishing face43.

The casing 25 inclosing the heating unit and closely fitting the bodysocket 40, and the air-cooled spider and tubular shank portion united tosaid casing, constitute a strong and durable means forfholding thehandle 30 in close proximity to the body 24, preventing the heating ofthe handle, and reinforcing the tubular portion of the body.

Said casing and the heating unit are adapted to be applied to andremoved from the body as a single part, and are readily separableto'perinit access to the resistance wire.-

Having described my invention, I claim: 1. An electrically heated toolcomprising i a body having a burnishing face or faces and a cylindricalsocket which is open at one end of the body, an electrical heating unit,a cylindrical casing detachably secured to and inclosing said unit andprovided with a shank composed of spaced arms joined to the casing andforming an air-cooled spider, and a tubular portion joined to said armsand spaced from the casing and heating unit thereby, a handle mounted onsaid tubular portion and held thereby in relatively close proximity tothe said casing and unit, and spaced therefrom by said spider, andconducting wires extending through said. tubular portion and handle, theheating unit comprising a resistance wire whose termi-- which is open atone end of the body, an

electrical heating unit comprising a spool having-inner and outerflanges, the outer flange being provided with outwardly projectingbinding posts, and a resistance wire wound upon the spooh'the terminalsof said wire extending through the outer flange-and -engaging saidbinding posts, means being provided for detachably connect1ng the spooland body, cylindrical casing detacna bly fitting said socket, seatedupon and ex tending between said flanges, and detachably 2. Anelectrically heated tool comprising-v secured to the spool, said casingbeing provided with a shank composed of spaced arms forming anair-cooled spider, and a tubular portion projecting from said spider, ahandle mounted on the tubular portion of the shank with its inner end inclose proximity to the body and heating-unit, and spaced therefrom bythe spider, andconducting Wires extending through the shank andconnected with the resistance wire terminals at ,said binding posts, thespaces between the spider arms not only permitting a free circulation ofair to cool the shank, but also permitting access to said binding posts.

3. An electrically heated hammering and burnishing tool comprising abody having a cylindrical socket which is open at one end of the body,the opposite end being closed, a

portion of said socket wall havin a rounded external face capable of useas a hammer 21) head, while another portion of said Wall has a flatburnishing face extending from end to end of the body, and a U-shapedburnishing face inclined relatively to said fiat face and intersectingthe latter to forman acute angled U-shaped burnishing edge extendingalong both sides of the body and across its outer end, and an electricalheating unit removably inserted in said socket.

In testimony whereof I have afiixeid my 30 signature, in presence of twowitnesses.

WILLIAM I. THOMPSON.

Witnesses:

LILLIAN M. THOMPSON, GEORGIANNA F. THOMPSON.

